CPython: 36 Years of Source Code
An analysis of the growth of CPython's codebase from its first commits to the present day
Python 3.12.13, 3.11.15 and 3.10.20 are now available!
Python Releases For Your Security! New security releases for 3.10, 3.11 and 3.12 are now available.
The Python Insider Blog Has Moved!
Python Insider now lives at blog.python.org, backed by a Git repository. All 307 posts from the Blogger era have been migrated, and old URLs redirect automatically.
Join the Python Security Response Team!
The Python Security Response Team now has an approved public governance document (PEP 811) and is welcoming new members.
Python 3.15.0 alpha 6
This is an early developer preview of Python 3.15 www.python.org/downloads/release/python-3150a6/ Major new features of the 3.15 series, compared to 3.14 Pyt...
Python 3.14.3 and 3.13.12 are now available!
Python 3.14.3 is now available! This is third maintenance release of Python 3.14 Python 3.14.3 is the third maintenance release of 3.14, containing around ...
Python 3.15.0 alpha 5 (yes, another alpha!)
Note: 3.15.0a4 was accidentally built against from 2025-12-23 instead of 2026-01-13, so this 3.15.0a5 is an extra release correctly built against 2026-01-14...
Python 3.15.0 alpha 4
Edit: This 3.15.0a4 was accidentally built against \ from 2025-12-23 instead of 2026-01-13, so 3.15.0a5 is an extra release correctly built against 2026-01-1...